ipa: rkisp1: Add support of Denoise Pre-Filter control

The denoise pre-filter algorithm is a bilateral filter which combines a range
filter and a domain filter. The denoise pre-filter is applied before
demosaicing.

Signed-off-by: Florian Sylvestre <fsylvestre@baylibre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

3 files changed, 295 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/algorithms/dpf.cpp b/src/ipa/rkisp1/algorithms/dpf.cpp
new file mode 100644
index 00000000..c93c8361
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/dpf.cpp
@@ -0,0 +1,258 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * dpf.cpp - RkISP1 Denoise Pre-Filter control
+ */
+
+#include "dpf.h"
+
+#include <cmath>
+
+#include <libcamera/base/log.h>
+
+#include <libcamera/control_ids.h>
+
+#include "linux/rkisp1-config.h"
+
+/**
+ * \file dpf.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+/**
+ * \class Dpf
+ * \brief RkISP1 Denoise Pre-Filter control
+ *
+ * The denoise pre-filter algorithm is a bilateral filter which combines a
+ * range filter and a domain filter. The denoise pre-filter is applied before
+ * demosaicing.
+ */
+
+LOG_DEFINE_CATEGORY(RkISP1Dpf)
+
+Dpf::Dpf()
+	: initialized_(false), config_({}), strengthConfig_({})
+{
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::init
+ */
+int Dpf::init([[maybe_unused]] IPAContext &context,
+	      const YamlObject &tuningData)
+{
+	std::vector<uint8_t> values;
+
+	/*
+	 * The domain kernel is configured with a 9x9 kernel for the green
+	 * pixels, and a 13x9 or 9x9 kernel for red and blue pixels.
+	 */
+	const YamlObject &dFObject = tuningData["DomainFilter"];
+
+	/*
+	 * For the green component, we have the 9x9 kernel specified
+	 * as 6 coefficients:
+	 *    Y
+	 *    ^
+	 *  4 | 6   5   4   5   6
+	 *  3 |   5   3   3   5
+	 *  2 | 5   3   2   3   5
+	 *  1 |   3   1   1   3
+	 *  0 - 4   2   0   2   4
+	 * -1 |   3   1   1   3
+	 * -2 | 5   3   2   3   5
+	 * -3 |   5   3   3   5
+	 * -4 | 6   5   4   5   6
+	 *    +---------|--------> X
+	 *     -4....-1 0 1 2 3 4
+	 */
+	values = dFObject["g"].getList<uint8_t>().value_or(utils::defopt);
+	if (values.size() != RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS) {
+		LOG(RkISP1Dpf, Error)
+			<< "Invalid 'DomainFilter:g': expected "
+			<< RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS
+			<< " elements, got " << values.size();
+		return -EINVAL;
+	}
+
+	std::copy_n(values.begin(), values.size(),
+		    std::begin(config_.g_flt.spatial_coeff));
+
+	config_.g_flt.gr_enable = true;
+	config_.g_flt.gb_enable = true;
+
+	/*
+	 * For the red and blue components, we have the 13x9 kernel specified
+	 * as 6 coefficients:
+	 *
+	 *    Y
+	 *    ^
+	 *  4 | 6   5   4   3   4   5   6
+	 *    |
+	 *  2 | 5   4   2   1   2   4   5
+	 *    |
+	 *  0 - 5   3   1   0   1   3   5
+	 *    |
+	 * -2 | 5   4   2   1   2   4   5
+	 *    |
+	 * -4 | 6   5   4   3   4   5   6
+	 *    +-------------|------------> X
+	 *     -6  -4  -2   0   2   4   6
+	 *
+	 * For a 9x9 kernel, columns -6 and 6 are dropped, so coefficient
+	 * number 6 is not used.
+	 */
+	values = dFObject["rb"].getList<uint8_t>().value_or(utils::defopt);
+	if (values.size() != RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS &&
+	    values.size() != RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS - 1) {
+		LOG(RkISP1Dpf, Error)
+			<< "Invalid 'DomainFilter:rb': expected "
+			<< RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS - 1
+			<< " or " << RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS
+			<< " elements, got " << values.size();
+		return -EINVAL;
+	}
+
+	config_.rb_flt.fltsize = values.size() == RKISP1_CIF_ISP_DPF_MAX_SPATIAL_COEFFS
+			       ? RKISP1_CIF_ISP_DPF_RB_FILTERSIZE_13x9
+			       : RKISP1_CIF_ISP_DPF_RB_FILTERSIZE_9x9;
+
+	std::copy_n(values.begin(), values.size(),
+		    std::begin(config_.rb_flt.spatial_coeff));
+
+	config_.rb_flt.r_enable = true;
+	config_.rb_flt.b_enable = true;
+
+	/*
+	 * The range kernel is configured with a noise level lookup table (NLL)
+	 * which stores a piecewise linear function that characterizes the
+	 * sensor noise profile as a noise level function curve (NLF).
+	 */
+	const YamlObject &rFObject = tuningData["NoiseLevelFunction"];
+
+	std::vector<uint16_t> nllValues;
+	nllValues = rFObject["coeff"].getList<uint16_t>().value_or(utils::defopt);
+	if (nllValues.size() != RKISP1_CIF_ISP_DPF_MAX_NLF_COEFFS) {
+		LOG(RkISP1Dpf, Error)
+			<< "Invalid 'RangeFilter:coeff': expected "
+			<< RKISP1_CIF_ISP_DPF_MAX_NLF_COEFFS
+			<< " elements, got " << nllValues.size();
+		return -EINVAL;
+	}
+
+	std::copy_n(nllValues.begin(), nllValues.size(),
+		    std::begin(config_.nll.coeff));
+
+	std::string scaleMode = rFObject["scale-mode"].get<std::string>("");
+	if (scaleMode == "linear") {
+		config_.nll.scale_mode = RKISP1_CIF_ISP_NLL_SCALE_LINEAR;
+	} else if (scaleMode == "logarithmic") {
+		config_.nll.scale_mode = RKISP1_CIF_ISP_NLL_SCALE_LOGARITHMIC;
+	} else {
+		LOG(RkISP1Dpf, Error)
+			<< "Invalid 'RangeFilter:scale-mode': expected "
+			<< "'linear' or 'logarithmic' value, got "
+			<< scaleMode;
+		return -EINVAL;
+	}
+
+	const YamlObject &fSObject = tuningData["FilterStrength"];
+
+	strengthConfig_.r = fSObject["r"].get<uint16_t>(64);
+	strengthConfig_.g = fSObject["g"].get<uint16_t>(64);
+	strengthConfig_.b = fSObject["b"].get<uint16_t>(64);
+
+	initialized_ = true;
+
+	return 0;
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::queueRequest
+ */
+void Dpf::queueRequest(IPAContext &context,
+		       [[maybe_unused]] const uint32_t frame,
+		       const ControlList &controls)
+{
+	auto &dpf = context.frameContext.dpf;
+
+	const auto &denoise = controls.get(controls::draft::NoiseReductionMode);
+	if (denoise) {
+		LOG(RkISP1Dpf, Debug) << "Set denoise to " << *denoise;
+
+		switch (*denoise) {
+		case controls::draft::NoiseReductionModeOff:
+			dpf.denoise = false;
+			dpf.updateParams = true;
+			break;
+		case controls::draft::NoiseReductionModeMinimal:
+		case controls::draft::NoiseReductionModeHighQuality:
+		case controls::draft::NoiseReductionModeFast:
+			dpf.denoise = true;
+			dpf.updateParams = true;
+			break;
+		default:
+			LOG(RkISP1Dpf, Error)
+				<< "Unsupported denoise value "
+				<< *denoise;
+		}
+	}
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::prepare
+ */
+void Dpf::prepare(IPAContext &context, rkisp1_params_cfg *params)
+{
+	if (!initialized_)
+		return;
+
+	auto &dpf = context.frameContext.dpf;
+
+	if (context.frameContext.frameCount == 0) {
+		params->others.dpf_config = config_;
+		params->others.dpf_strength_config = strengthConfig_;
+
+		const auto &awb = context.configuration.awb;
+		const auto &lsc = context.configuration.lsc;
+		auto &mode = params->others.dpf_config.gain.mode;
+
+		/*
+		 * The DPF needs to take into account the total amount of
+		 * digital gain, which comes from the AWB and LSC modules. The
+		 * DPF hardware can be programmed with a digital gain value
+		 * manually, but can also use the gains supplied by the AWB and
+		 * LSC modules automatically when they are enabled. Use that
+		 * mode of operation as it simplifies control of the DPF.
+		 */
+		if (awb.enabled && lsc.enabled)
+			mode = RKISP1_CIF_ISP_DPF_GAIN_USAGE_AWB_LSC_GAINS;
+		else if (awb.enabled)
+			mode = RKISP1_CIF_ISP_DPF_GAIN_USAGE_AWB_GAINS;
+		else if (lsc.enabled)
+			mode = RKISP1_CIF_ISP_DPF_GAIN_USAGE_LSC_GAINS;
+		else
+			mode = RKISP1_CIF_ISP_DPF_GAIN_USAGE_DISABLED;
+
+		params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_DPF |
+					     RKISP1_CIF_ISP_MODULE_DPF_STRENGTH;
+	}
+
+	if (dpf.updateParams) {
+		params->module_en_update |= RKISP1_CIF_ISP_MODULE_DPF;
+		if (dpf.denoise)
+			params->module_ens |= RKISP1_CIF_ISP_MODULE_DPF;
+
+		dpf.updateParams = false;
+	}
+}
+
+REGISTER_IPA_ALGORITHM(Dpf, "Dpf")
+
+} /* namespace ipa::rkisp1::algorithms */
+
+} /* namespace libcamera */
diff --git a/src/ipa/rkisp1/algorithms/dpf.h b/src/ipa/rkisp1/algorithms/dpf.h
new file mode 100644
index 00000000..128ebd5e
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/dpf.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * dpf.h - RkISP1 Denoise Pre-Filter control
+ */
+
+#pragma once
+
+#include <sys/types.h>
+
+#include "algorithm.h"
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+class Dpf : public Algorithm
+{
+public:
+	Dpf();
+	~Dpf() = default;
+
+	int init(IPAContext &context, const YamlObject &tuningData) override;
+	void queueRequest(IPAContext &context, const uint32_t frame,
+			  const ControlList &controls) override;
+	void prepare(IPAContext &context, rkisp1_params_cfg *params) override;
+
+private:
+	bool initialized_;
+	struct rkisp1_cif_isp_dpf_config config_;
+	struct rkisp1_cif_isp_dpf_strength_config strengthConfig_;
+};
+
+} /* namespace ipa::rkisp1::algorithms */
+} /* namespace libcamera */
diff --git a/src/ipa/rkisp1/algorithms/meson.build b/src/ipa/rkisp1/algorithms/meson.build
index e48974b4..93a48329 100644
--- a/src/ipa/rkisp1/algorithms/meson.build
+++ b/src/ipa/rkisp1/algorithms/meson.build
@@ -6,6 +6,7 @@ rkisp1_ipa_algorithms = files([
     'blc.cpp',
     'cproc.cpp',
     'dpcc.cpp',
+    'dpf.cpp',
     'filter.cpp',
     'gsl.cpp',
     'lsc.cpp',